Stop-valve



Nomaden A'. RAPPOLD.

STOP VALVE. No. 293.355. Patented'feb. 12, 1884.

UNrrnD uSTATES PATENT ()Frrcn ALBERT RAPIOLD, OF TITUSVILLE, PENNSYLVANIA.

STO P-VALV E.

SPECIFICATION forming part of Letters V:Patent No. 293,355, dated Februaryr12, 1884.

Application filed December `26, 1882. -(Normodel.)

To all whom it may concern-.f

Beit known that I, ALBERT RAPPOLD, a citizen of the United States, residing at Titusville, inthe county of Crawford and State of Pennsylvania, have invented a new and Improved Stop-Valve, of which the following is a specification. Q I

My invention is more particularly adapted for pipes used in conveying sulphurlc acidA or similar corrosivev substances, since all the eX- posed parts can be made of lead or other soft metal not affected by the acid; but it is useful in stop-valves for use in any kind of liquid, and an improvement on the valves now 1n use.

The mechanism is illustrated in the accompanying drawing, which shows a vertical section of my valve through thel center with the` valve partially closed. l A represents the valve-chamber; B, walls of same; C, inlet 4pipe; D, discharge-pipe; E,

i valve-seat; F, valve; G, valve-stem;H`, neck of valve-chamber; I, packing-box; K, handle or winch. l The valve F is made the frustum of a cone inverted, the valve-seatE being made conical to receive the valve F.` The valve F is made to engage with the button g on the lower end of the valve-stem G, which button is circular, allowing of a free rotary motion of the valve-stem G independently of the valve F; but the valve F is raised or lowered withv the valve-stem G, this being operated by a screwthread on the stem engaging with a corresponding thread on the inside of the neck H of the valve-chamber, or in any other similar or ordinary manner. The valve F and valve-seat E arepmade oflead or some similar soft metal, as also may be the walls B of the valve-chamber. 4The valve and valve-seat being of soft metal, if any slight obstruction being upon the exterior walls of the chambenit can be supported, as necessary, upon the outside by a firmer metal.

The operation is simple and explains itself.

'By the rotating of the valve-stem Gby means ofthe handle or winch K, the valve F is forced down into the valve-seat E,w11en the y from leaking.

aperture is fully 4closed and all passage of uid is stopped. While in'this position, the pressure of iuidthrough the inlet-pipe G presses the valve intoplace, packs it, andv prevents it By reversing the operation on the valve-stem, the valve F is raised more or less as required, and the fluid passes, as indicated by the arrows in the drawing.

One practical advantage ascertained to be derived `from the .use of lead as a metal for the valve and valve-seat for stop-valves used in V4pipes for conveying sulphuric acid is this:

With other metals, when the valves remain closed for some time, a hard crust or coating forms, which is difficult to break, sometimes the valve being broken in the effort to open it. With lead the action of theacid lubricates the surfaces, and prevents any such crust from forming to prevent the action of theV valve.

I make no claim for the manner of raising and lowering the valve F by means of the valve-stem Gin the manner illustrated, that being an old device.

1What I claim as my invention is As an improved article of m anufactur'e, astopcock valve especially adapted for corrosive substances, and comprising avalvechamber, A, formed of lead or equivalent soft metal, .and consisting of the walls B and the conical valve seat E, formed integral with the walls B,

and forming the bottom ofthe valve-chamber,

the cap-pieceH, the operatingstem G, the conical valve-plug F, corresponding to the seat E, and likewise formed of lead or an equivalent soft met-al, whereby should particles become lodged between the plug and seat they will be compressed into the soft metal, and not prevent closing of the valve, and the discharge-pipe D, having a conical throat that encircles theV soft-metal seat E and protects and strengthens the same from damage from the outside, substantially as set forth.

ALBERT BAPPOLD.

Vitnesses: i

J. A. SHUTT, F. B. WrNANs. 

